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Serial Ports: COM2, COM3 and COM4
COM2 is a pin header for second serial port.
Pin
Signal
1
DCD
2
SIN
3
SOUT
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Digital I/O Pin-header: J1
General purpose input and output for POS systems.
Pin
Signal
1
+5V
3
GPO5
5
GPO6
7
GPO7
9
GPO12
11
GND
Description
Data Carry Detect
Serial In or Receive Data
Serial Out or Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request To Send
Clear To Send
Ring Indicate
Pin
Signal
2
+12V
4
GPI10
6
GPI21
8
GPI28
10
GPI29
12
GND
21
Installation
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